diff --git a/security/sandbox/moz.build b/security/sandbox/moz.build
index a41b16894e24..52e896a04568 100755
--- a/security/sandbox/moz.build
+++ b/security/sandbox/moz.build
@@ -159,7 +159,7 @@ elif CONFIG['OS_ARCH'] == 'WINNT':
     for var in ('UNICODE', '_UNICODE', 'NS_NO_XPCOM',
                 '_CRT_RAND_S', 'CHROMIUM_SANDBOX_BUILD'):
         DEFINES[var] = True
-    if CONFIG['CC_TYPE'] != 'gcc':
+    if CONFIG['CC_TYPE'] not in ('gcc', 'clang'):
         DEFINES['SANDBOX_EXPORTS'] = True
 
     LOCAL_INCLUDES += ['/security/sandbox/chromium-shim']